Here is the blog following the tech companies that went kaput. The first entry I see is as on June3, 2006.
WCAG is part of a series of accessibility guidelines, including the Authoring Tool Accessibility Guidelines (ATAG) and the User Agent Accessibility Guidelines (UAAG). Essential Components of Web Accessibility explains the relationship between the different guidelines.
We need to make sure that we use this information for all new UI that we are generating.